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14.6 - Stop & ISO

ISO is one of the countries on your camera.

ISO 800 is more sensitive to light than an ISO 100 setting.

You can take photographs in dimmer light more readily.

But you don't have a sense for how much more readily, unless you speak Stop.

Stop gives you the answer: 3 stops more readily.

Let's go from ISO 100 to ISO 800 using Stop.

ISO 100 to ISO 200	ISO Doubles	1 Stop More Sensitive
ISO 200 to ISO 400	ISO Doubles	1 Stop More Sensitive
ISO 400 to ISO 800	ISO Doubles	1 Stop More Sensitive

So, the total change is three stops.

An ISO 800 setting is three stops more sensitive to light than ISO 100.

So?

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